Friction damped truck



Sept. 6, 1949. L. A. I EHRMAN FRICTION DAMPED TRUCK 2 Sheets-Sheet 1 Filed June 15, 1945 www Sept. 6, 1949. 1 A. LEHRMAN FRICTION DAMPED TRUCK 2 Sheets-Sheet 2 Filed June 15, 1945 m. w T N@ m M 1 I l/ 0.1 www M N@ @of NQ. 1|. QM. NN. @DI @L www( O@ d@ Q@ Q@ Patented Sept. 6, 1949 FRIeTIoN-DAMPEDI friction Y Leo-A. Lehrman, Chicago, Ill., assigner-.to Ameri can Steel Foundries, Chicago, Ill;a .corporation ofNew Jersey c Application 'J une 15;-1945, Serial ,No4 `599,543

I 9-Claims.I (Cl. My invention relates :to railway--ocantrucks and, more particularly, to a four; Wheel; freightxcan truck wherein a bolster is resiliently supported upon-spaced side frames and frictionrneans is so associated with the side -frame and bolster structure asto control theraction .of .the load support-,-

ingisprings.

A specicobject of, my inventionis to sodevise sucht-a railway car truck-that.,theirictional con.- trol elements willbemounted'at remotely spacedv =10` points. at opposite sides of the car truck in. order i to secure theadvantages inherent. in such an ar= rangement.: It is. wellvknown to those skilled: in 1 theart that the squaring effect ofcontrolmeans is increased for the same amount of: .energy abe sorption as the means of lapplying ther energy isaordeda longer leverage. In 'my-novel arrange'` ment, I have so mounted the frictional control .between the side frames and vbolster lasuto secure r maximumA advantage.

Another object of Vmy invention isy to devise/fa.y novel form of side framestructure in whichfthe ordinary truss type side frame :is modied'to pro-V Videa bracket onthe outboard-faceof each column whichmay afford a housing for a friction absorb-'- ing deviceincludinga friction shoe` andan associated actuating spring.

Still ranother object of -my invention is' to devise such :a railway car Vtruckwherein'. thefriction ele`- ments are so mounted as tolpermitassembly and v30 dismantling ,thereofin the side frame without-.ree moving the bolster endrfrom' the bolsterfropening@A of the side frame and,fat the same time, permit inspection of all frictionzsurfaces and?v ride con. trol elements while the truck is fully assembled;

Adifferent. obj ect of my invention iszto provide vsuchsafourwheelrailway `car truckgas above indicated in'which spaced'sidet-irames may be aff; fordedfoutboard friction means for-cooperation.'` with-thelextremities of abolster spring-supported `.4:0 from. said side frames.

In the drawings:

Figure-1 is a `fragmentaryside elevation of a. railway car truck embodying my invention.;

Figure 2 is a fragmentary'toprplan viewzofzthe railway cartruck illustrated infFig'urel, Y

Figure 3 is a fragmentary sectionalyiew 1in .aa vertical longitudinal plane through the .truck structure shown in Figures. 1 :and 2,-ithesectionf. being taken approximately as indicatednby the;.501 line3-.3 of Figure 2..

Figure 4 is a sectional viewthroughrmy1 novel f. sideI frame: structure, the sectionbeing taken apa I proximately the. transversexvertical plane l-bif-f `sectingothe frarnefas indicated by @ther line :444- sof.: 555A 2 n Figure 1,thebo1ster, ofcourse, .being omitted-from the rshowingvyiniFigure I Figure 5 isa `fragmentary sectional View througlnA the .aside frame bracket rhousing -the friction ideer4 vicettlie section vbeing takenapproximately inthe. longitudinalvertical plane -indicated .by -the line 5-5 .off Figure 4A Figures 6, '7, and 8 show my -novel vformotfric-,.wA tion, slioe,-Figure 6 being-aside elevation-thereofii, Figure 7 an elevational,- view `taken fromfthe-leit l; as seen inFigureGg-andFigureS aftopplanview thereof.

My novel arrangement issshown'as appliedtoaaf.` fourl wheel *railway` freightcar truck Imore or. 4 less. conventional insformin which-a truss type-sida: rameis used, said ,side frame having acom'pres-f sionrmember, -a tension member 4,-and ,the ,usualal column-:b` at each side of the bolsterlopening f withinlwhichmay be receiveditheend portiongnota thefbolster generally designated I`0.;-.The tensione member l "between the .columnsV- 6,* 6 ymay .be -rofvK r boxesection witha widened top chord l 2 affordin'gr.:v a snringsea-tat -I dysaid box-section alsocomprisg ingtherside wall 16,'.lthe "bottom Wall :18;and'vthe, center `rib 20, .(Figure 4),. Onthe lspringlseatf '14@r maybe `supported :a plurality ofcoilr springs diai-. l grammatically indicated-at 22, vsaidfsprings as illustratedin Figure 1 being seated on-the bottom 1 v spring .-platef24 -and said plate beingV` interlockedfg with the -side frame bythe usual dowel means :26.11., Y The upper-end of thesprings 2222 afford 1a-seat# as at/28 for the bottom of the bolster,Y lfsaida bolster being of boxfsection-withthe.topgwall ,3&55 the bottom Wall 32the side wall 34,-and the longi-V4 tudinal .center frib 36. 4 The upper portion of eachcolumn 6 mayjhaVe" bolster guide;,means 'of well-knownforrrrleoni-ffml prisinga substantially vertical concave cylindrical i, facci 38 emerging at thefinboard l and outboardure 2)A vand affording cooperation Awithv comple-l.,v mentary cylindrical `and fdiagonalf. faces onl there adjacent vbolster side wall;- Inboard leachcolumn';Y eachlcbolster: side wallis aordeda ,guide lug. Mft

:adjacentthe usual brake hanger bracket Maand.;-

outboard the column the .bolster side Wall,` extendedto form a frictionvwall 48V, on lthe outer;` face of; which may be supported'the wear plate 58.1 As already indicated,.a bracket housing .gene ally designated 5I may be integrally formedlon-the outboard face of eachcolumn l,said.bracket.:hay,Vr f ingra substantially horizontal bottom `wallol'iZ-,ethev .f reinforcing gusset 54 therebelow,A anoutboard wall-1; 55 Figure-.4 l, and a .rearlwall 5a-navman yerticat slotlll) through .which may projectrthehandlep-'likee Y thenshoe-in such position during-assembly ordis,-

V pint-inserted in the loop 62 of each`shoe,thus

loop portion 62 of the friction shoe generally designated 64. The rear wall 58 may continue up'- Wardly in the reinforcing gusset 66, merging with the compression member above said bracket, and a substantially parallel vertical gusset 68 may 5 also be formed above said bracket. The gusset 68 may continue downwardly into the diagonal wall 10, said diagonal .wall merging with the rear wall .Y 58 at a point"12 radjacentY the lower end of the bracket, as Well seen in Figure 1. The diagonal .lo wall 10 is also formed with an elongated slot 14 in alignment with the before-mentioned slotflllgY as well seen in Figure 4. At opposite sides of the slot 14 in the diagonal wall 'lll maybe formed in 1 board and outboard friction 'surfaces 16 "and '18*15Y affording bearing for the diagonal surfaces 8D, 80 at opposite sides of the enclosed. friction shoe Each frictionv shoe may have a substantially. rectangular vertical friction wall 82 whichmay have at face engagement `as at 84 with the ad- 20 jacent vvbolsterfriction .wearplate15 Dfi The-friction? shoe 64 may bea cup-shaped structure with the!A before-mentioned vertical* `friction wall 82 thfe rear-wall, lthe '-handle or loop portiony 62,' the 1 topwall 88-,and1the diagonal-walls, Sil-at oppositelside's'fof rtheloop-GZ, inthe Aupper Vfaces of said l' diagonal walls 90, 90 aiiording thebefore-men-w tioned--diagonal fseats 8.8; Bil-where the shoe ymaybearf'against complementar-y -faces von thewallA 10-of1thebracketfhousirg5h The friction wall 30 82 may extend `as at: 92above thetop wall 88 .in` order to aiford added wearing areas on the bolster engagingfface; The-friction-shoe 54`maybe cored away at: thesides except v-for-thetie bars 93'," 93v adj acentA the bottom edge, andl 'the bottom may Y be--lef-tsopen, saidl bottom opening 94V accommodatingthe insertion within said-shoe kof the'shoe actuatingvspring -96,1the-bottom of' said spring'.- beingseatedrasate'on-the bottom wall 52 of the,r` bracketrhousingrl,"and-the upperVv end ofxsaidr spi-ing being. afforded'a seat` as at` HID. :(Figure 3)` against the: top wall 88 of theifrictionfshoeso rthat saidcompression vspring 96-`is 'effective to urge the friction 'shoe vagainst the diagonal wall 105 v`of the housing bracketf along which" it vmay-*have limited 45 sliding movement-and be `urged into engagementasat 184iwithrthe adjacent bolster wear-plateil f It Willfbelunderstood, of course, that as the bolster i end Vmoveslaterallyl in the bolster'opening of the side lframe eachiifriction shoein thejhousingY ofi* ther-respective column will slide' along the diagonal wall-`f10,and-thespring-96 will beralways under sufficient compression -to maintain each frictionV` shoetightly inv :engagement with Y the `wall"'l8,-a s well as with the adjacent side wall'fof thebolster.

Theloop Vor handle-like? portion on each frictionl-:shoeI-faiords lsa-means of engagingfapinch'Y bari or' :the like for moving `the V`shoe y outVVV of en-1 ga'gementv Iwith the f bolsterv or- .for maintaining. I

iria-ntlingfy operations, as` `will beA readily` under# stoodfbythose skilledzin lthe art.` Whenlit is de?vk siredfifor.exampleftolreplace worn shoes, leach f shoemay bewedged downwardly and a securing' 65 retainingethefshoe. in f such depressed :position whereit-'is :free of the bolster. The bolster sup-l:v porting -springs may v.then be removed, 'permita tinglthebolster'to .reston thetensionl member of the-iframe,y afterwhichthe. worn shoes may be replacedabyZ new'. ones. f Subsequently', thefbolster mayaf-be. elevateduto i itsfnormal .position A`and Lthe supportingspringsfreplaced..4 Y i Y z` Itr-willi-thusbeseen that:` mylnovel arrangement acrdsidenitef control; of movements?Y of; fthe7.2iftheadjacentetrictionsface,and-;resilient,smeansY l gwithrtension :andcornpression .members 'and yve l.

fportions; planecfrictionlfacesLon each side oft-said;

ftegral ho'usingszxonsaid colurnnsponningf:fric

4 Y bolster end longitudinally of the side frame and, at the same time, affords maximum squaring effect by providing friction control at the extremi-` ties of the bolster, both of which results are obtained while a substantially constant frictional force is operative to snub the load springs on which lthe bolstergmay be supported from Vthe side frame] Anyfpoutfof-square movement Slof.. the bolster with'respect to theside Vframe which may be induced by normal operating conditions will bei-fopposed by my novel arrangement, and the returrrto vnormal position will be induced by the unbalance of forces at opposite sides of each bolster end l Zwhen suchet out-of-squareness takes It is tobeunderstood that I do not wish to be limited byftheqexactj,embodiment of the device shownwhich is merely by way of illustration and not=limitatin as various and other forms of the device will, of course, be apparent to those skilled in .the art 1 Without: #departing '.form .the Y spiriti'of. th'einvention or the scope of the claimsf Iiclaim i. fer. f Y, Y u 11.4 In fa railwayc'ar truck; ispacedr lside-:frarnesi-1ly tical l colunfn'iss:defining bolster:ope'nings-,-v verticalli cylindrical portions on said columns, arbolsteraf` springesupporteidon saidtension members insaidv openings-withcomplementary f acesengaging bolster, outboard said columns,z .integral .housings-,ek on saidcolumns; confining :frictionishoes :force gagementwithisaicb fa'cesgeach of said;;friction Y shoes ;havingr1slidable .rabutments` alongy spaced aligned surfaces. ofa uwall of the :adjacent housings:

and having1 a surfaceengagingthe adjacent frio-.1 tion-face; andxzresilient means :zassociatediwithg each shoe for urging .,itint'o fengagementwi-th their f adjacent zhousingnwall landtfrictionzzface,cache resilient means being housedfwithinctheassomH ciatedl shoe. Aand projecting itherefroms fon .abu ment:withyanothelfwall' of; the adjacent housin Y aligned slots ,ein said diagonalcwallandein afwallof..` saidfbrackettremote :from fsaid bolster lopenin saidresilient :means being' positioned -infsaid yshoe-1V f in thefplanerdefned ylflyisaid aligned openingssl 2. In a railway car truck,a side: frame-of:tr'u'sss` type- Comprisingjtension and: compression meme:y bers vandspaced columns; defining-2a bolsterfopenewface4 iof each; column; in; the formioffa housin for,associatedfsfriction meanaxsaid'housing hay .y f ing "a bottom wallrdeflningra `=spring.seat,^:a .Wall remote from fisaid opening .;.with a vertical` lslo :thereimand' fa 'ldia'gonalawall with a slot'xaligne Y withsf'saidffirst-mentioned slot; said ,alignedwslotsa accommodatinggasportion ofranassociatedfrictio shoe,y and said seat affording kan abutmentiforaa associated .spring iinv `the-vertical :planes `define rality of seats for said shoe within said 'housingsi 3. In a railway car truck, spa'cedfside'fra'rrtesiA withtension and compression member-s1 andifver-, tical columns defining Abolster 'openings,if'verticalct' ecylindrical portions on :said ecolumns, .y a bolster;

spring-supported .orr'said tension?" members; ini;4 l said openings:withacomplernentary facesilengag-,a

ingafsaid portions; planer-:frictionay faces :on each sidefzbfnasaidf bolsternoutboard,said :columns tion shoes for engagement with saidxfacespeac of saldi friction shoes l'having slidable:.abutrnentx along; spaced :aligneel-surfaces,V ofr `-a Awall-fgoif-7 their; adjacent fhousingzfandhavingi a surface engagin associated with each shoe for urging it into engagement with the adjacent housing wall and friction face, said aligned surfaces being spaced at opposite sides of an opening in the associated wall and said last-mentioned opening being aligned with an opening of corresponding width in an adjoining wall of the housing for accommodation of a portion of the associated friction shoe.

4. In a railway car truck, a side frame of truss type comprising tension and compression members and spaced columns dening a bolster opening, a bracket integrally formed on the outboard face of each column in the form of a housing for associated friction means, said housing having a .bottom wall defining a spring seat, a wall remote from said opening with a vertical slot therein, and a diagonal Wall with a slot aligned with said first-mentioned slot, said aligned slots accommodating a portion of an associated friction shoe and said seat affording an abutment for an associated spring in the vertical planes defined by said slots.

5. In a railway car truck, a side frame of truss ty-pe comprising tension and compression members and spaced columns deiining a bolster opening, a bracket integrally formed on the outboard face of each column in the form of a housing for associated friction means, said housing having a bottom wall defining a spring seat, a wall remote from said opening with a vertical slot therein, and a diagonal wall with a slot aligned with said first-mentioned slot, said diagonal wall having aligned friction surfaces at opposite sides of the slot therein and said bracket having spaced parallel gussets extending thereabove and merging with the side wall of the compression member of said frame,

6. In a railway car truck, a side frame of truss type comprising tension and compression members and spaced columns defining a bolster opening, a bracket integrally formed on the outboard face of each column in the form of a housing for associated friction means, said housing having a bottom wall defining a spring seat, a wall remote from said opening with a vertical slot therein, and a diagonal wall with a slot aligned with said first-mentioned slot, said aligned slots accommodating a portion of an associated friction shoe and said seat affording an abutment for an associated spring in the vertical planes defined by said slots, said diagonal wall affording a plurality of seats for said shoe within said housing, each of said housings having spaced vertical walls extending transversely of said truck and merging with the compression member of the side frame thereadjacent.

7. In a railway car truck, a side frame of truss type comprising tension and compression members and spaced columns dening a bolster opening, a bracket integrally formed on the outboard face of each column in the form of a housing for associated friction means, said housing having a bottom wall defining a spring seat, a wall remote from said opening with a vertical slot therein, and a diagonal wall with a slot aligned with said first-mentioned slot, said aligned slots accommodating a portion of an associated friction shoe and said seat affording an abutment for an associated spring in the vertical planes 6 defined by said slots, each of said diagonal walls merging with spaced vertical walls of the associated housing and said spaced vertical walls being extended to merge with the compression member thereabove.

8. A side frame and friction shoe assembly comprising a truss type side frame having tension and compression members and spaced columns defining a central opening, housings on one side of said frame, one on each of said columns, each housing having a substantially vertical wall remote from said opening with a vertical slot therein, a bottom wall dening a spring seat, and a diagonal wall merging with said firstnamed wall adjacent the bottom thereof and sloping upwardly toward said opening, a slot in said diagonal wall in alignment with said vertical slot longitudinally of said frame, and friction means in each housing comprising a friction shoe and an actuating spring therefor, the slots in said diagonal and Vertical Walls accommodating a portion of the associated shoe, each spring being substantially vertically disposed and seating at one end against the associated spring seat and at the other end against the associated shoe for urging the latter upwardly against the respective diagonal wall and along the same outwardly of the associated housing toward said opening.

9. In a railway car truck, a side frame of truss type comprising tension and compression members and spaced columns dening a bolster opening substantially centrally of said frame and spaced Window openings adjacent opposite ends of said frame, housings on one side of said frame, one on each column, for enclosing associated friction means, each housing having a vertical wall merging with the associated sides of the compression member and related column adjacent the respective window opening, a bottom wall merging with said vertical wall and adjacent side of the related column, a side wall spaced from the related column and merging with the outer edges of said vertical and bottom walls, a diagonal wall merging with the upper edge of said side wall and with the adjacent side of the related column and with said vertical wall adjacent the lower end thereof, and a gusset depending from said bottom wall and merging with the related column, said diagonal wall sloping upwardly toward said opening and having a vertical slot aligned with a slot in the vertical wall, said aligned slots being adapted to receive a portion of an associated friction shoe and said seat affording an abutment for an associated spring in the planes defined by said slots.

LEO A. LEHRMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 716,294 Shallenberger Dec. 16, 1902 1,414,958 Kadel May 2, 1922 2,084,028 Hedgecoek June 15, 1937 2,295,549 Cottrell Sept. 15, 1942 2,346,614 Rydin Apr. 11, 1944 2,378,414 Light June 19, 1945 

